Did I botch my glass job??

[JohnDory]

Hi everyone
Yesterday afternoon I coated the starboard bottom plank (3/8" doug fir ply)on my 15 foot v-hull in 7.5oz cloth using West System. The port side came out great (nice and clear) but the starboard side cured to a white haze...although It seems to have cured good and hard. The hull will be painted so the color does not concern me. I am afraid I may have problem down the road with that side. I was thinking it may have been the fact that I glassed it late in the day and since it is outside, moisture interupted the cure last night. Has anyone ever had this happen? Should I remove the layer of glass and do it again?
Any ideas are greatly appreciated
Chris

[NormMessinger]

I'd guess moisture caused the goop to flush. Try setting it out in the sun to cook before you do anything drastic.

--Norm

[Thaddeus J. Van Gilder]

I have had it happen when both temperature, and moisture, as well as both well the problems.

Those are the experiences that make me stick to plain old cedar on oak nowadays.

I can and have planked clinker boats outside in a snowstorm.

you sure can't do that with epoxy.

Thad

[Dale Genther]

I've had the same thing happen to me a couple of times, although on a smaller scale. It is caused by moisture, most likely dew in your case. The difficulty of getting rid of it is dependant on how "set" the epoxy was before the moisture got to it. If minor it can be cured by setting it in the sun for a while, or by wiping it with acetone. Once I had to sand it lightly to remove the white. If its "deep" into the epoxy I don't know how to go about removing it. In my case it did not appear to affect the adhesion of the epoxy.

[Buddy Sharpton]

No big scare here. It did cure, only a little more porously around the moisture molecules. I would wet sand to get rid of that hase that will come easily, then put on a coat of epoxy to reseal. Will behave just like the other side from there on out.

[Seth Wood]

This may be "amine blush" that sometimes forms when epoxy cures. Check out this link from CLC, and scroll down to "Prepare the surface" for their suggestions on it.
http://www.clcboats.com/shoptips_poly.html

[imported_maguro]

It seems as though the haze is mostly on the surface though won't rub off with acetone. The adhesion to the wood seems great so I am not going to mess with it. I'll just wet sand before putting another couple coats of goop on and hope for the best.
I should have pictures coming soon,
Thanks
Chris

[brad9798]

In a word- NO ... as long as you paint over it!

[Buddy Sharpton]

Again, that hase is the porosity OF the surface, which cured aroung moisture molecules. Since acetone won't dissolve cured epoxy, it won't remove cured, albeit porous epoxy either. That porosity won't run deep , but it will flatten the gloss of what goes on next. It should ABRADE away easily and then be fine, but to be sure the surface behaves like the other side, reseal with a coat of epoxy. While you don't require removing all hase as you aren't finishing bright, this should do the trick quickly. You could eben RO sand with 150 and do it faster-the epoxy will fill those stracthes in one thin coat-no more is necessary, you're adding weight, time, and expense with overkill.

[thechemist]

It's not amine blush, which is an oily surface film. It's almost certainly water, and may be on the surface or through the layer. If surface, it can be sanded off. If throughout the film thickness, you have a cured two-phase system which will be significantly weaker than a properly cured layer of that epoxy system.

Since you laid up 7.5 ounce cloth with it, the resin system supporting those glass fibers will be significantly weaker, and there will be a poor bond to the fibers, giving a much weaker composite.

Compare it to doing a glass/epoxy layup with wet glass cloth.

If this were an airplane I would say tear it off and start over, since your life depends on it.

Since it is a boat, and not mine, it is easy for me to say tear it off and start over on that side. If it were mine I would.

You will likely get some years of service from it before you see delamination failures on the starboard side.

Your choice.